Show INTERESTING ARTICLE ON ZINC MINING IN BUTTE A H 11 ethy tin the Ie well known engineer in the I and ami metallurgist has the following current of 01 th tit the Engineering Min Mining Mm lIn lIning ing log Journal on Zinc Mining in Butte Butte has haz been een known for tor so long ng aUme a s time Ume as one of the greatest sources of ot supply of ot copper in the world that it has not received much recognition here heretofore heretofore as a probable center from which large quantities of or zinc may be fur furnished furnished fished It Is true that considerable quan quantities of zinc ore have been found from Crom time to time in various arlUs of the thc producing copper mines of ot Butte but such ores ore have been more mure valuable for copper and eUver r than for fur th tn zinc they contained and aRd no effort has baa been made mado to recover the zinc c Extensive development work during the last milt two years jears ears in the eastern end of the Rainbow lode hlf has bus resulted In the discovery of Immense deposits of ot zinc lore ore containing from 10 lQ to 50 per cent zinc In order to render the ores Of ot sufficiently high grade for the zinc smelters me meren ren the Butte reduction works has re recently recently installed a concentration con plant for that purpose The concentration of ot zinc Inc ores or s differs from that of 01 the copper ores in the Butte camp With the copper ores every effort is made matle to save as much of or the copper co r as possible with a minimum amount of crushing It is only on I after alter all the coarse mineral has bait been saved that fine tine crushing Is resorted to io in order to save MC the copper in the slimes With the Zinc inc ores it Is found necessary ne to crush the ore ora much finer than is the practice with the copper ores The concentrates from the ores developed h I the Elm Orlu mine owned by b the Elm EI I Orlu OrIn Mining company and the Black Rock Bock mine owned by b the Butte Superior Copper I company readily concentrate up to above aboe 40 per cent zinc and will carry in ad addition from I 3 to 4 per cent copper from 10 II to 39 51 ounces sliver silver and from SI I 1 to 32 2 in gold The zinc smelters after die dis distilling tilling off the zinc sell the residue to lead and copper smelters for tor whom it is an excellent material it being practically free from sulphur while most of ot the zinc is eliminated in the distillation process The concentration at the Butte reduction works will have a capacity of about tons per day It requires about 2 to 2 tons tone of the zinc ore to make 1 ton of ot zinc concentrates concentrate It is estimated that In the two properties already re reo referred referred to there are approximately tons lons of zinc ore oro already developed It seems singularly appropriate that ex Senator W V A Clark who has been In Interested Interested In the Butte district for tor over thirty years and was on one of the pioneers In the development of or its mines and also In the erection of plants for the treat treatment treatment treatment ment of ot sliver silver ores and then for the treatment of copper ores should now be among the pioneers In the tiie erection of ot a n plant for fOt the wet concentration of ot zinc ores res The Elm Orlu property Is owned by Clark and his hi son W V A Clark Jr while the Butte Dutte reduction works Is owned by b Clark and andis is the oldest smelting and concentrating plant in this district having been In con continuous continuous continuous since ISIS 1885 |